BOP-Cl reagent BOP peptide coupling, referring to the use of the BOP reagent (benzotriazol-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate, is a critical method for forming peptide bonds in modern organic synthesis. As a widely recognized peptide coupling reagent, BOP facilitates the efficient formation of amide bonds between amino acids and peptides, playing a crucial role in both solid-phase and solution-phase peptide synthesisCoupling Reagents. Its ability to provide excellent coupling behavior and good solubility in common solvents makes it a valuable tool for researchers aiming to construct complex peptide sequences.
The fundamental process of BOP peptide coupling involves the activation of a carboxylic acid group on one amino acid (or peptide) to create a reactive intermediate. This activated species is then susceptible to nucleophilic attack by the amine group of another amino acid or peptide, resulting in the formation of a new peptide bond and the release of the BOP reagent's activating moiety. This mechanism is central to building longer peptide chains, a process that underpins significant advancements in drug discovery, biochemistry, and materials science.
The BOP reagent, chemically known as (Benzotriazol-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate, functions by forming an activated ester or an acyloxyphosphonium salt intermediate.BOP Reagent vs. PyBOP for Peptide Synthesis This intermediate is highly reactive and readily undergoes nucleophilic attack by the amine component. The overall reaction is typically carried out in organic solvents such as N,N-dimethylformamide (DMF) or N-methylpyrrolidone (NMP), which facilitate good solubility and reaction kinetics.
The mechanism of BOP-mediated coupling is often depicted as involving the formation of an O-acylisourea intermediate or, more precisely, an active ester.BOP Reagent vs. PyBOP for Peptide Synthesis This activated species is then attacked by the free amine of the coupling partner, leading to the formation of the desired peptide bond. While effective, it's important to note that the use of BOP can generate hexamethylphosphoramide (HMPA) as a by-product, which is a known carcinogen. This has led to the development of alternative reagents.
BOP peptide coupling offers several distinct advantages that have contributed to its widespread use. It is renowned for its efficiency in forming peptide bonds, often proceeding rapidly and to a high degree of completion.BOPis a reagent commonly used for the synthesis of amides from carboxylic acids and amines inpeptidesynthesis. This is particularly beneficial in solid-phase peptide synthesis (SPPS), where rapid and complete coupling reactions are essential for maximizing yields and minimizing side products. BOP couplings using the solid-phase procedure have been shown to proceed more rapidly and to a greater extent of completion compared to some older methods.
Furthermore, BOP reagent is effective in suppressing enantiomerization during the coupling process, a crucial factor for maintaining the stereochemical integrity of the synthesized peptides. This is particularly important when dealing with sensitive amino acids or when synthesizing peptides with specific conformational requirements. The reagent's good solubility also contributes to its versatility, allowing for its application in both solution and solid-phase methodologies.
Despite its efficacy, the generation of carcinogenic by-products like HMPA has prompted the development and adoption of alternative peptide coupling reagents.Choosing the Right Coupling Reagent for Peptides: A Twenty ... Among the most prominent alternatives is PyBOP® (benzotriazol-1-yloxy)tripyrrolidinophosphonium hexafluorophosphate), an analog of BOP where the dimethylamino groups are replaced with pyrrolidino groups作者：A Fournier·1988·被引用次数：124—BOP couplings using the solid phase procedureproceeded more rapidly and to a greater degree of completion for peptide bond formations that were previously .... PyBOP exhibits equivalent properties in peptide bond formation and is often preferred due to its reduced toxicity profile.Coupling Reagents Other related reagents, such as BOP-Cl (Bis(2-oxo-3-oxazolidinyl)phosphorodiamidic chloride), are also employed as coupling agents for amide and ester formation, offering different reactivity profiles and by-product considerations作者：M Gairí·1990·被引用次数：78—BOP couplingreagent suppresses the formation of diketopiperazines in the solid-phasecouplingof the third amino acid to dipeptides..
When selecting a coupling reagent, factors such as reaction efficiency, yield, the potential for side reactions, the cost of the reagent, and importantly, the toxicity of by-products, must be carefully weighed. While BOP remains a potent tool, awareness of its limitations and the availability of safer, equally effective alternatives like PyBOP and HBTU (which also generate OBt esters) is essential for modern peptide synthesis.Such performance may be because of the fact that the activation of the urethane-protected amino acid withBOP-Cl renders first the corresponding acid chloride ... The choice of coupling reagent directly impacts the success of the synthetic strategy, influencing the purity, yield, and stereochemical fidelity of the final peptide product.
Join the newsletter to receive news, updates, new products and freebies in your inbox.